I have Fedora 15 with both KDE and Gnome-Shell. At work if I log into KDE, I can set the resolution on my external monitor correctly to 1680 x 1050. If I log into Gnome 3, the highest I can set the monitor is 1280x1024. The monitor is detected as the correct brand in Gnome 3, but evidently it is an incorrect model.
How can I fix the setting in Gnome? I could not find an xorg.conf anywhere and I didn't see anything that looked correct in /etc/gdm. I am thinking it is a Gnome issue, rather than an X server issue since the monitor is detected correctly in KDE.